Composition of matter for sound-records or the like and process of making the same



- UNITED STATES PATENT OFFICE.

THOMASA. msoN, LLEWELLYN PARK, WEsT ORANGE, NEW .IEasEr, ASSILGNOR To NEW JERSEY PATENT coMrANY, 0E WEsT ORANGE, NEW JEEsEY, A CORPORA- 'IION OF NEW JERSEY.

comrosrTroN OF MATTER Ton. soUNE-EEcoEDs on. THE LIKE AND PROCESS OF I MAKING THE SAME.

1,342,326. Specification of Letters Patent.

No Drawing.

To all wh'ov n it may concern:

Be it known that I, THoMAs A. EnIsoN, a citizen of the United States, and a resident of Llewellyn Park, West Orange, New Jerhave invented a certain new and useful Composition of Matter for Sound-Records or the Like and Process of Making the Same, of which the following is a description. I

My invention relates to an improved com* position of matter and to improved articles,

' such as sound re'cords,-formed from said composition. The principal object of my invhntion is to form a hard composition which does not adhere to a sound record matrix or other moldwhich has a high melting point, and which is insoluble in the usual solvents.

'-I have found that su'cha. composition can densing agent soas to cause a molecular albe formed by treating shellac with a conparts of very finely powdered. dry wood pulp is then thoroughly mixed with the solution in a mixing machine, after which the compo-' sition-is dried by driving off the alcohol or other solvent, as in a vacuum drier, the alcoholfbeing preferably condensed and saved. The dried materia'lproduced in this way is then preferably gropnd to a very fine powder which is molded under heat and pres:-

sure in a suitable mold, the heating being carried on a sufficient time to cause the complete condensing. action of the paraphenylg,

enediamin onthe shellac, The object of using the'pressure is simplytocause the powder to cohere and take th'e proper im-..'

pression from the mold. 'It is found that the article so formed has far less tendency to adhere to the mold than :does ordinary shellac. lhe composition of which the article is formed is much harder than shellac andis notsoluble inalcohol-or the ordinary solvents, and does not melt at anytemperature below that of its decomposition, the melting point being higher than that of shellxac. I

- derstood that Patented June 1, 1920'.

Application nled August 26, 1915. Serial No. 47,520.

am not aware of its exact chemical compo- Y sition.

The above described composition has been found excellent for phonograph or sound records. When such records are formed from said composition, I preferably apply.

, to the surface of a blank of the composition a thin coating or layer of thermo plastic or readily moldable material. The surface ma trial, may, for example, be shellac, celluloid, or the final hardened phenolic condensation product described in U. Sipatent to Aylsworth No. 1,111,285, in which a plasticity agent is incorporated to render the prod ct sufiiciently plastic at elevated tempera ures to be molded. When the record is a fiat or disk record, both faces of the same are preferably formed with a surface layer of an im ressionable material.

While embodiment of my invention, it is to be un'-' thereto. 7

Havingmow described my invention,.what

K I claim and desire 'to protect by Letters Patparts ent is as follows 1. A composition of matter formed bythe condensation of sh'ellac by means of paraphenylenediamin, substantially as described.

2. A composition of matter formed by heating shellac with paraphenylenediamin, substantially as described.

condensation of shellac by means of para.-

pbefiylenediamin, substantially as described.

4'. A composition of matter comprising a finely divided filler and a binder formed of a condensation productof shellac arid paraphenyl'enediamin, substantially'as described.

5. A composition of matter comprisin a finely divided fibrous filler and a: binder formed of a condensation product of shellac and: para.phenyle mediamin, substantially as described. L

have described a certain specific my invention is not limited- 3. A composition of matter formed by the nder heat and pressure,

' I I I I j r 6. A composltion of matter comprising a finely divi ded. filler and a binder" of 'a,con l f ,densation'. product of 'shellacand paraphenylenediamimthefiller being in excess pf the binder, substantially as described.

7 ..'A sound record containing a condensaf diamin, substantially as described, j

tionproduct ofshellac and paraphenylene- 10 5 I 8. A composition of matter formed by the condensation of shellac by means of phenylenediamin, substantially as described.

9. A sound record containing a condensation product of shellac, substantially as described.

10. The process which comprises heating shellac with phenylenediamin, substantially as described.

11. The process which comprises heating shellac with paraphenylenediamin, substantially as described.

12. The process which comprises heating shellac with' paraphenylenediamin under substantially as described.

13. A composition of matter formed by the condensation of shellac.

heating shellac under pressure with a con densing agent to a temperature sufficient to cause condensation of the shellac.

16 A process which comprises heating shellac'with a condensing agent to a temperature sufficient to cause condensation of the shellac.

This specification signed and witnessed this 21st day of August, 1915. THOS. A. EDISON.-

Witnesses: l FREDERICK BACHMANN,

. J. UNGER. 

